78787 has 2 divisors, whose sum is σ = 78788. Its totient is φ = 78786.

The previous prime is 78781. The next prime is 78791.

78787 is nontrivially palindromic in base 10.

78787 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 78787 - 2³ = 78779 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

78787 is an undulating number in base 10.

It is not a weakly prime, because it can be changed into another prime (78781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39393 + 39394.

It is an arithmetic number, because the mean of its divisors is an integer number (39394).

2⁷⁸⁷⁸⁷ is an apocalyptic number.

78787 is a deficient number, since it is larger than the sum of its proper divisors (1).

78787 is an equidigital number, since it uses as much as digits as its factorization.

78787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21952, while the sum is 37.

The square root of 78787 is about 280.6902207060. The cubic root of 78787 is about 42.8698063107.

The spelling of 78787 in words is "seventy-eight thousand, seven hundred eighty-seven".